Depending on EXACTLY what you have and its condition, 50 to a few thousand USD.
look on the net for a marlin gun collectors site, they have that info.
I happen to have the same rifle. I have been looking for worth and owners manuals for the gun and the only info i can find on the gun is it was made in 1983.
The Gun Trader's Guide gives $185 for the Marlin AS 30-30 in NRA Good condition
If the gun is in perfect shape it is worth not more than $100
marlin 12 gauge bolt action goose guns sell for about $200 in great condition
I to have this gun and yes it is the same to take apart. I guess the gun was made only one year and that was in 1979.
From what I understand from research, the Marlin No. 42 was manufactured one year 1922. I have seen prices rangeing from $300 to $2200 for a trench gun style 12 Ga. I guess it mostly depends on condition and how much a particular person wants your particular gun.
We need the model.
The marlin model 336, 32 special was made in 1949. f25689=the letter in front of the number justifies the year.
The value of a Marlin Cal bolt action model 187 gun depends on its condition. This gun in excellent condition is worth between 90.00 and 135.00 as of 2014.
$80- $150, if it has the magazine, and if it's in decent shape.
The first two numbers of the given serial number indicate the year the gun was manufactured. In this case, the gun was made in 1973.